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Condenser fan set screw tacked

My condenser fan motor is overheating after a few hours use. I noticed the exhaust from the fan is coming out from the top and a few inches down to below the cover. When I checked the blades it seem they have slipped down the shaft about an inch and a half (there is a mark on the shaft where the set screw was originally). The problem is that the set screw is tacked. Do I try to break the weld and maybe mess the fan up? Any suggestions?

Could be glue

Originally Posted by mark beiser

More likely it is some sort of glue or sealer.
It wouldn't make any sense, from a manufacturing or service standpoint, for it to be welded.

It could be a bead of glue, it was starting to get dark last night when I was looking at it. It is definitely a bead on the set screw. I saw the fan blades had slipped down the shaft and when I went to loosen the set screw it wouldn't budge and then I noticed the bead. The unit hasn't been repaired since install, just maintenance. It's a Comfort Star unit and parts aren't readily available here (Cayman Islands) so I don't want to $&?!-up the fan and have to wait two weeks for a new one. I've already looked for a replacement motor and none here with the RPMs I need, only one variable speed motor for $$, so I know no ones going to have a fan blade for my unit.